This is as minimal of a PR that I could make stuch that:
 1) It compiles and tests run single composer plus minimal
 2) All the key changes are present (abstract/grpc class, comment composer, class names, golden files move)

 I had to add a few quite ugly and artificial   constructs:
 fake `ClassComposer` under `composer` package which simply extends `composer.common.Composer` to void changing the rest of the classes
 put back static methods in `ClassNames` and `StubCommentComposer` and `TestProtoLoaderUtil` (for the same reasons as above). All of those chagnes are marked with `// TODO: remove after Pre-DIREGAPIC refactoring is fully merged` statement.

* chore: Pre-DIREGAPIC Refactoring #1

 This is as minimal of a PR that I could make stuch that:
 1) It compiles and tests run single composer plus minimal
 2) All the key changes are present (abstract/grpc class, comment composer, class names, golden files move)

 I had to add a few quite ugly and artificial   constructs:
 fake `ClassComposer` under `composer` package which simply extends `composer.common.Composer` to void changing the rest of the classes
 put back static methods in `ClassNames` and `StubCommentComposer` and `TestProtoLoaderUtil` (for the same reasons as above). All of those chagnes are marked with `// TODO: remove after Pre-DIREGAPIC refactoring is fully merged` statement.

🤖 I have created a release \*beep\* \*boop\* 
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## 0.1.0 (2020-03-30)


### Features

* initial generation ([9f6eb94](https://www.github.com/googleapis/java-shared-dependencies/commit/9f6eb949f579ad25c63b47b95551375005930ca1))


### Dependencies

* update dependency com.google.api:api-common to v1.9.0 ([#3](https://www.github.com/googleapis/java-shared-dependencies/issues/3)) ([a0b3721](https://www.github.com/googleapis/java-shared-dependencies/commit/a0b3721afd62ff79cf7685ab7b608d145c5ab5da))
* update dependency org.threeten:threetenbp to v1.4.2 ([#4](https://www.github.com/googleapis/java-shared-dependencies/issues/4)) ([8264473](https://www.github.com/googleapis/java-shared-dependencies/commit/826447349fc7fef642c6a2bfcc0d10bc79acc89c))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).